About
HSK levels

    轨道 軌道

    guǐdào

    1. track (for trains etc); orbit (of a satellite); (audio engineering) track
    2. (fig.) a person's established path in life; desired trajectory (of a business or other endeavor); (quantum mechanics) orbital

    火车在铁轨上沿着轨道运行。 huǒchē zài tiěguǐ shang yánzhe guǐdào yùnxíng.